For a while I thought that 28-75 Tammy is too big for K100D, but now it's pretty much its soulmate, with the FA 35 as the mistress
Personally I find the MZ series body + Grip + M40 to be a really nice combination balance and ergo wise. The K100D + M40 not so much, but still pretty nice. I generally prefer bigger lenses (FA 50 and up) on the K100D.
I have yet to find the perfect match for the ME super... The Tak 28 seems to be its best match for now though.
While the subject is on M-series body, I personally find with the leather case equipped the ME super handles much better than without. I don't enjoy using the grip myself though.